The male river chub builds nests by carefully choosing and arranging stones in the riverbed to create a mound that attracts females and provides a safe place for eggs.

The male river chub builds nests by carefully choosing and arranging stones in the riverbed to create a mound that attracts females and provides a safe place for eggs.

He works hard, constantly adjusting the stones and replacing any that roll off the nest. His attention to detail is clear when he moves the entire nest by a foot, showing his commitment to making the best environment for spawning.